Rotating or turning to the right, especially describing substances that rotate polarized light clockwise.
From dextro- 'right' and gyratory 'rotating,' combining Latin and Greek roots. Standard term in chemistry since the 1800s for describing optical rotation direction.
A substance can be dextrogyratory even if you can't see it rotating—you need special equipment (a polarimeter) to detect how it spins light, which is how chemists sort out identical-looking molecules!
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